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Finding the Fourth Proportional to 1,591.28, 2,387 and 495.64

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Solution

The fourth proportional to 1,591.28, 2,387 and 495.64 is: 743.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,591.28 : 2,387 = 495.64 : x
  2. Step 2: Convert to fraction form
    1,591.28/2,387 = 495.64/x
  3. Step 3: Cross multiply
    1,591.28x = 2,387 × 495.64
  4. Step 4: Simplify right side
    1,591.28x = 1,183,092.68
  5. Step 5: Solve for x
    x = 1,183,092.68/1,591.28
  6. Step 6: Final answer
    x = 743.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.